Like a major city, a cell teems with specialized workers that carry out its daily operations—making energy, moving proteins, or helping with other tasks. Researchers took microscopic pictures of thin layers of a cell and then combined them to make this 3-D image featuring color-coded organelles—the cell’s “workers.” Using this image, scientists can understand how these specialized components fit together in the cell's packed inner world. Courtesy of Kathryn Howell, a cell biologist at the University of Colorado Health Sciences Center. Featured in the August 15, 2006, issue of Biomedical Beat. High res. image (144 KB JPEG)